Wednesday

April 16, 2014

April 16, 2014

Posted by **karen** on Saturday, August 11, 2012 at 5:40am.

1.) A random digit from 1 to 9 (inclusive) is chosen, with all digits being equally likely. The probability that when it's squared it will end with the digit 1.

2.) A random number between 1 and 20 (inclusive) is chosen. The probability that its square root will not be an integer.

- probability -
**MathMate**, Saturday, August 11, 2012 at 7:08am1. Find how many (initial) digits when squared gives one. Dividing that by 9 will give you the required probability.

Also, it may be of interest to note that single digits that add up to 10 have the same last digits when squared.

Example: 2²=4 8²=(10-2)²=64 also ends with the digit 4.

2. Again, determine how many "perfect squares" there are among the numbers 1 to 20. Divide that number by 20 will give you the probability.

**Related Questions**

math - please help! 1.) A random digit from 1 to 9 (inclusive) is chosen, with ...

Probability - How could picking three dates at random in the month of April be ...

stats please help test tom - When a computerized generator is used to generate ...

Probability please help! - The digits 2, 3, 4, 7, and 8 are each used once in a ...

stats again please help - When a computerized generator is used to generate ...

math - Assume that 3 digits are selected at random from the set { 2, 5, 6, 8, 9...

finite math - suppose that 3 digits are selected at random from the set S={1,2,3...

Finite Math - Assume that 3 digits are selected at random from the set {1,3,5,6,...

does anyone know probability???? - The digits 2, 3, 4, 7, and 8 are each used ...

probability - The digits 2, 3, 4, 7, and 8 are each used once in a random order ...